class TestRectangle {
  public static void main(String args[]) {
    Rectangle rec1 = new Rectangle(3,7);
    Rectangle rec2 = new Rectangle(2,5);

    System.out.println("Diagonale de rec1 : "+rec1.diagonale());
    System.out.println("Surface de rec1 : "+rec1.surface());
    System.out.println("Perimetre de rec1 : "+rec1.perimetre());

    System.out.println("Perimetre de rec2 : "+rec2.perimetre());
    rec2.doubler();
    System.out.println("Nouveau perimetre de rec2 : "+rec2.perimetre());
  }
}